Some articles made of silver, copper and iron get coloured coating over them when they are . exposed to air.
Some articles made of silver, copper and iron get coloured coating over them when they are . exposed to air. Identify the colour and chemical name of the substance of coating in each case.
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(i) Silver: Colour - Black
Chemical Silver sulphide
(ii) Copper: Colour - Green
Chemical name - Copper oxide
(iii) Iron: Colour - Reddish Brown
Chemical name - Ferric oxide
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